Now boil potatoes, peel it and cut it into 1cm cubes.
Chop onion into small pieces, cut tomato into medium pieces. Remove seeds from Green chili and chop it finely.
Roast cumin powder.
Heat oil in a non stick pan and put green chili, ginger, onion into it for a minute.
Now add Chana and potato and toss till they turn slightly brown.
Add tomato and toss it over moderate heat. Now sprinkle cumin powder, red chili powder and chaat masala Put into a bowl and sprinkle fresh coriander and salt on it. For tangy flavor add lemon juice to it.